储能科学与技术 ›› 2015, Vol. 4 ›› Issue (5): 493-497.doi: 10.3969/j.issn.2095-4239.2015.05.006

• 研究及进展 • 上一篇    下一篇

液流电池理论与技术——荷电状态的表征

洪为臣, 李冰洋, 王保国   

  1. 清华大学化学工程系,北京 100084
  • 收稿日期:2015-08-16 出版日期:2015-10-19 发布日期:2015-10-19
  • 通讯作者: 王保国,博士,教授,从事膜材料、储能科学与技术研究,E-mail：bgwang@tsinghua.edu.cn。
  • 作者简介:洪为臣（1990—）,男,硕士研究生,研究方向为锌空气电池,E-mail：hongwc13@mails.tsinghua.edu.cn
  • 基金资助:
    国家自然科学基金（21276134）和国家“863”计划项目（2012AA051203）

Theoretical and technological aspects of flow batteries：Measurement of state of charge

HONG Weichen, LI Bingyang, WANG Baoguo   

  1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2015-08-16 Online:2015-10-19 Published:2015-10-19

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摘要： 电池实际可放出的瓦时容量与实际可放出的最大瓦时容量的比值定义为荷电状态,准确测定荷电状态对储能应用十分重要。本文从理论和应用角度,讨论全钒液流电池荷电状态的理论概念、工程定义和主要影响因素;提出2种确定最大瓦时容量的方法,其中实测法准确度更高,包含钒离子跨膜迁移、水分子扩散、负极电解液析氢和被氧化的信息,用于表征储能系统的荷电状态具有实际价值;阐述最大瓦时容量、电化学瓦时容量和理论瓦时容量的区别与联系。所提出的荷电状态确定方法,能够用于全钒液流电池SOC的估计。

关键词: 液流电池, 荷电状态, 最大瓦时容量, 表征方法

Abstract: State of charge (SOC) indicates the ratio of the schedulable capacity to that of available maximum W·h capacity in an energy storage system, which is necessary parameter for energy storage applications. This study clarified SOC concept framework for all vanadium redox flow battery from both theory and applications, proposed two approaches to determine the maximum W·h capacity. The measured method has high accuracy, containing information relative to vanadium ions transport and water diffusion through membranes, hydrogen emission and oxidization in the negative electrolyte by side-reaction, having promising potential for use in the characterization of the state of charge in practical system. We also elaborated the relationship of the maximum W·h capacity, electrochemical W·h capacity and theoretical W·h capacity. It can be expected that this method can be used to determine the state of charge in vanadium redox flow battery R&D process.

Key words: flow battery, state of charge, maximum W·h capacity, measurement

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